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<head><meta charset="utf-8"><title>unicode normalization ~25%  wall time regression · t-compiler/performance · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/index.html">t-compiler/performance</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html">unicode normalization ~25%  wall time regression</a></h3>

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<a name="210333856"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210333856" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> matthiaskrgr <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210333856">(Sep 16 2020 at 23:51)</a>:</h4>
<p>Looks like building unicode-normalization takes ~25% longer since <a href="https://perf.rust-lang.org/compare.html?start=a055c5a1bd95e029e9b31891db63b6dc8258b472&amp;end=7402a394471a6738a40fea7d4f1891666e5a80c5&amp;stat=wall-time">https://perf.rust-lang.org/compare.html?start=a055c5a1bd95e029e9b31891db63b6dc8258b472&amp;end=7402a394471a6738a40fea7d4f1891666e5a80c5&amp;stat=wall-time</a> ?<br>
I'm curious because there was no note of that in the triage report.</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210335619" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210335619">(Sep 17 2020 at 00:20)</a>:</h4>
<p>I don't recall seeing that during triage</p>



<a name="210335851"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210335851" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210335851">(Sep 17 2020 at 00:24)</a>:</h4>
<p>Hm a bunch of commits there look like they have changes</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210335892" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210335892">(Sep 17 2020 at 00:24)</a>:</h4>
<p>Maybe the clicking is broken</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210336177" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210336177">(Sep 17 2020 at 00:29)</a>:</h4>
<p>I think there's a bunch of smaller regressions (&lt;1% perhaps?)</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210336225" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210336225">(Sep 17 2020 at 00:30)</a>:</h4>
<p><a href="https://perf.rust-lang.org/index.html?start=35fc8359868e65a0970094f648ba87fce634e8c7&amp;end=a53f449516f23486d2dfd4e5685d4e869e8591d9&amp;absolute=false&amp;stat=instructions%3Au">https://perf.rust-lang.org/index.html?start=35fc8359868e65a0970094f648ba87fce634e8c7&amp;end=a53f449516f23486d2dfd4e5685d4e869e8591d9&amp;absolute=false&amp;stat=instructions%3Au</a></p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210336235" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210336235">(Sep 17 2020 at 00:30)</a>:</h4>
<p>Graph shows regressions for sure though</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210336284" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210336284">(Sep 17 2020 at 00:31)</a>:</h4>
<p>Yeah, I think that's it. So I probably missed them because they're less than 1%</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210336354" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210336354">(Sep 17 2020 at 00:32)</a>:</h4>
<p>Oh, that's a wall time link</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210336362" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210336362">(Sep 17 2020 at 00:32)</a>:</h4>
<p>I don't look at wall time at all during triage usually</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210336663" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210336663">(Sep 17 2020 at 00:38)</a>:</h4>
<p>We should probably revert that PR</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210337062" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210337062">(Sep 17 2020 at 00:46)</a>:</h4>
<p>I will probably follow up on this tomorrow</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/unicode%20normalization%20%7E25%25%20%20wall%20time%20regression/near/210545758" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> matthiaskrgr <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/unicode.20normalization.20~25.25.20.20wall.20time.20regression.html#210545758">(Sep 18 2020 at 16:44)</a>:</h4>
<p>for the record: the regression was mentioned on the PR ticket <a href="https://github.com/rust-lang/rust/pull/76244#issuecomment-694459840">https://github.com/rust-lang/rust/pull/76244#issuecomment-694459840</a></p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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